Global Patent Index - EP 0077627 B1

EP 0077627 B1 19871014 - CORROSION RESISTANT STEEL COMPONENTS AND METHOD OF MANUFACTURE

Title (en)

CORROSION RESISTANT STEEL COMPONENTS AND METHOD OF MANUFACTURE

Publication

EP 0077627 B1 19871014 (EN)

Application

EP 82305400 A 19821011

Priority

  • GB 8131133 A 19811015
  • GB 8138318 A 19811218
  • GB 8205999 A 19820226
  • GB 8220495 A 19820715

Abstract (en)

[origin: ES8402027A1] A non-alloy steel component is nitrocarburized at 550 DEG to 720 DEG C. for up to 4 hours in a nitriding gaseous atmosphere eg. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxide-rich layer thereon before being quenched into an oil/water emulsion, degreased and a tack-free wax coating applied. Alternatively, the component may be cooled in air or other oxidizing atmosphere and then wax coated or it may be cooled in a non-oxidizing atmosphere and then reheated to provide the oxide-rich surface layer before being cooled again and wax coated. As a further alternative, the component may be cooled, lapped to a surface roughness of not more than 0.2 micrometers Ra, reheated to oxidize and then quenched. These techniques give a good corrosion resistance to the component.

IPC 1-7

C23C 8/34

IPC 8 full level

C21D 1/72 (2006.01); C21D 9/00 (2006.01); C23C 8/26 (2006.01); C23C 8/32 (2006.01); C23C 8/34 (2006.01); C23C 8/80 (2006.01)

CPC (source: EP US)

C21D 9/0068 (2013.01 - EP US); C23C 8/26 (2013.01 - EP US); C23C 8/34 (2013.01 - EP US); C23C 8/80 (2013.01 - EP US)

Citation (examination)

Designated contracting state (EPC)

DE FR GB IT SE

DOCDB simple family (publication)

EP 0077627 A2 19830427; EP 0077627 A3 19841010; EP 0077627 B1 19871014; AU 555300 B2 19860918; AU 8938382 A 19830421; BR 8206004 A 19830913; DE 3277460 D1 19871119; DE 3280464 D1 19950216; DE 3280464 T2 19950524; ES 516577 A0 19840116; ES 8402027 A1 19840116; IN 157874 B 19860712; JP H0699796 B2 19941207; JP S6452054 A 19890228; PL 139312 B1 19870131; PL 238640 A1 19830509; SU 1407404 A3 19880630; US 4496401 A 19850129; US 4596611 A 19860624; YU 232882 A 19850320; YU 43100 B 19890228

DOCDB simple family (application)

EP 82305400 A 19821011; AU 8938382 A 19821014; BR 8206004 A 19821014; DE 3277460 T 19821011; DE 3280464 T 19821011; ES 516577 A 19821015; IN 1211CA1982 A 19821015; JP 17281288 A 19880713; PL 23864082 A 19821015; SU 3504253 A 19821014; US 43338082 A 19821008; US 66803284 A 19841105; YU 232882 A 19821015